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Question by SuperMoog · Aug 25, 2015 at 12:13 PM · guicanvasscalecoordinate-system

Canvas Scaler - scaleFactor

Hey,

I am slightly confused by the nature of canvas.scaleFactor and the Canvas Scaler. I am converting from world to canvas coordinates. Let me show you two code examples:

1. My Initial Attempt

     public static Vector2 WorldToCanvasPoint(
         this Canvas canvas,
         Vector3 worldPosition,
         Camera camera = null)
     {
         if (camera == null)
             camera = Camera.main;

         var screenPosition = camera.WorldToScreenPoint(worldPosition);

         return new Vector2(
             (screenPosition.x - (Screen.width * 0.5f)) * canvas.scaleFactor,
             (screenPosition.y - (Screen.height * 0.5f)) * canvas.scaleFactor);
     }

2. What Worked

     public static Vector2 WorldToCanvasPoint(
         this Canvas canvas,
         Vector3 worldPosition,
         Camera camera = null)
     {
         if (camera == null)
             camera = Camera.main;

         var screenPosition = camera.WorldToScreenPoint(worldPosition);

         var scaler = canvas.GetComponentInParent<CanvasScaler>();
         var guiScale = 1.0f;

         if (Mathf.Approximately(scaler.matchWidthOrHeight, 0.0f))
             guiScale = scaler.referenceResolution.x / (float)Screen.width;
         
         else if (Mathf.Approximately(scaler.matchWidthOrHeight, 1.0f))
             guiScale = scaler.referenceResolution.y / (float)Screen.height;

         return new Vector2(
             (screenPosition.x - (Screen.width * 0.5f)) * guiScale,
             (screenPosition.y - (Screen.height * 0.5f)) * guiScale);
     }

I would have expected scaleFactor to work in the same manner as the second code snippet above. I would appreciate it if someone is able to explain why the scaleFactor approach does not work and therefore what scaleFactor actually represents and its intended usage.

Also I was originally using a scaler in "expand" screen match mode. In order for this to work I of course need to use the "match width or height" screen match mode which means I do not have a methodology for the "expand" mode (or "shrink"). Again I would be very grateful for an explanation as I cannot find this information described clearly anywhere.

Thanks in advance for your time...

Mark

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